<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        html {
            /*background: yellow;*/
        }
        body {
            background-color: skyblue;
        }

        div {
            background-color: red;
        }
    </style>
</head>
<body>
<div></div>
</body>
</html>